drm: sun4i: add support for H6 TCON TOP

The TCON TOP on Allwinner H6 SoC is a cut down version of the R40 TCON
TOP, which dropped TCON_TV1 and DSI (which do not exist on H6).

Add support for it.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181104182705.18047-27-jernej.skrabec@siol.net

drivers/gpu/drm/sun4i/sun8i_tcon_top.c

@@ -273,12 +273,20 @@ const struct sun8i_tcon_top_quirks sun8i_r40_tcon_top_quirks = {
 	.has_dsi	= true,
 };
 
+const struct sun8i_tcon_top_quirks sun50i_h6_tcon_top_quirks = {
+	/* Nothing special */
+};
+
 /* sun4i_drv uses this list to check if a device node is a TCON TOP */
 const struct of_device_id sun8i_tcon_top_of_table[] = {
 	{
 		.compatible = "allwinner,sun8i-r40-tcon-top",
 		.data = &sun8i_r40_tcon_top_quirks
 	},
+	{
+		.compatible = "allwinner,sun50i-h6-tcon-top",
+		.data = &sun50i_h6_tcon_top_quirks
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun8i_tcon_top_of_table);